Webra 1.20 and Dave Patrick Ultimate
Jerry,
I have a Webra 120 in a scratch built Ultimate ( similar in size to yours ).It is a very reliable powerful engine.I use a 20 oz tank & currently a 16.5 x 8 Bolly carbon prop.I previuosly used a 15x8 APC ( a good prop as well ) although the 16.5 x 8 seems a better choice performance wise for my airframe.Hope this helps.